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x in (-oo:+oo)
(40/5)*x+(60/4)*x = 20*x+40/5 // - 20*x+40/5
(40/5)*x+(60/4)*x-(20*x)-(40/5) = 0
(40/5)*x+(60/4)*x-20*x-8 = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x = 8/3
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